Research on the Cross-Fringe-Operation Error of FOGs
In interferometric fiber-optic gyroscopes(FOGs),when the modulation signal exceeds the limit and undergoes a 2π reset,a 2π phase difference appears between the modulation amount of the modulation-signal input and the input angular velocity.This causes the interference phase to shift left or right by 2π,i.e.,a cross-fringe op-eration.In a FOG closed-loop system,the error caused by the cross-fringe operation is reflected in the random-walk coefficient and nonlinearity.In this study,a cross-fringe error-cancellation mechanism is established by optimizing the modulation scheme,which can cause the cross-fringe errors to cancel each other,thus greatly improving the nonlinearity and random-walk coefficient.After simulated and physical verification,the results show the effective-ness of this method.
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